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恒能環(huán)保介紹什么才是堿法生物脫硫？

首頁- 新聞資訊 > 公司新聞

2021-08-11

有機廢棄物資源化利用的過程中被厭氧處理后，產(chǎn)生的沼氣中含有多種氣體，其中的CH4是非常好的清潔能源,但H2S卻是一種具有惡臭的腐蝕性氣體，對后續(xù)的管道、沼氣柜、燃氣燃燒設備等都具有很強的腐蝕性，且H2S燃燒后產(chǎn)生SO2濃度很高，對自然環(huán)境的污染十分嚴重。因此，沼氣在利用之前都需去除沼氣中的H2S，避免對后期設備的腐蝕。

After anaerobic treatment in the process of resource utilization of organic waste, the biogas produced contains a variety of gases, of which CH4 is a very good clean energy, but H2S is a corrosive gas with odor, which is highly corrosive to subsequent pipelines, biogas cabinets and gas combustion equipment, and the concentration of SO2 produced after H2S combustion is very high, The pollution to the natural environment is very serious. Therefore, H2S in biogas shall be removed before biogas utilization to avoid corrosion to later equipment.

堿法生物脫硫過程分為兩步：

The alkaline biological desulfurization process is divided into two steps:

一：沼氣通過脫硫反應塔將沼氣中H2S從氣相轉(zhuǎn)化成液相。脫硫反應塔就是一個洗滌塔，沼氣從塔底部進入并穿過濾料床。微堿性循環(huán)水從塔頂進入，經(jīng)過專用噴頭打散，自由落體穿過濾床，專用濾料可以使沼氣與循環(huán)水進一步打散和延長接觸時間，提高洗滌效果。含有硫化物的循環(huán)水從脫硫反應塔底部流入再生池。

1： The H2S in biogas is converted from gas phase to liquid phase through desulfurization reactor. The desulfurization reaction tower is a scrubber, and the biogas enters from the bottom of the tower and passes through the filter bed. The slightly alkaline circulating water enters from the top of the tower, is dispersed by the special nozzle, and falls freely through the filter bed. The special filter material can further disperse the biogas and circulating water, prolong the contact time and improve the washing effect. The circulating water containing sulfide flows into the regeneration tank from the bottom of desulfurization reaction tower.

二：再生池完成循環(huán)水中硫化物被氧化的過程，循環(huán)水中有大量的脫硫菌（主要為無色硫細菌等）將以硫化物為食，把硫化物轉(zhuǎn)化為自身的營養(yǎng)物質(zhì)，進入微生物的自身循環(huán)過程，從細菌體內(nèi)排出單質(zhì)硫和氫氧根，從而達到降解的目的。

2： The regeneration tank completes the oxidation process of sulfide in circulating water. A large number of desulfurization bacteria (mainly colorless sulfur bacteria) in circulating water will feed on sulfide, convert sulfide into their own nutrients, enter the self circulation process of microorganisms, and discharge elemental sulfur and hydroxyl from bacteria, so as to achieve the purpose of degradation.

再生池內(nèi)創(chuàng)造循環(huán)水中脫硫菌的生存環(huán)境，再生池內(nèi)的換熱器給循環(huán)水提供熱量，保證循環(huán)水溫度在33-34度左右。曝氣頭給循環(huán)水提供氧氣，保證循環(huán)水適當?shù)娜芙庋酢Ｃ摿蚓ㄟ^消化循環(huán)水中的硫化物新陳代謝產(chǎn)生副產(chǎn)品單質(zhì)硫和硫酸根，硫酸根會導致循環(huán)水的pH值降低，還需通過加藥系統(tǒng)適當增加一些堿液中和這5%的硫酸根。

The regeneration tank creates a living environment for desulfurizing bacteria in circulating water, and the heat exchanger in the regeneration tank provides heat to the circulating water to ensure that the temperature of circulating water is about 33-34 degrees. The aeration head provides oxygen to the circulating water to ensure proper dissolved oxygen in the circulating water. Desulfurizing bacteria produce by-products elemental sulfur and sulfate by digesting sulfide metabolism in circulating water. Sulfate will reduce the pH value of circulating water. It is also necessary to add some alkali solution to neutralize the 5% sulfate through the dosing system.

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